.sort{
    width: 1200px;
    height: 30px;
    margin: 20px auto;
}
.nav{
    width: 1200px;
    height: 30px;
    display: flex;
    justify-content: space-evenly;
    border: 1px solid #ccc;
    text-align: center;
    margin: 20px auto;

}
.nav div{
    line-height: 30px;
}
.box{
    width: 1200px;

 margin: 0px auto;

}
.list{
    width: 1200px;
    height: 25px;
    line-height: 25px;
    display: flex;
    justify-content: space-evenly;
    border: 1px solid pink;
    text-align: center;
   
}
.tan{
    width: 100%;
    height: 100vh;
    background-color: #ccc;
    display: none;
}